Earplug



FIG. 1 is a front plan view of an earplug showing our new design, the broken line showing is for illustrative purposes only and forms no part of the claimed design.

FIG. 2 is an elevational view thereof taken from the right of FIG. 1, the opposite side being a mirror image thereof;

FIG. 3 is an elevational view thereof taken from the top of FIG. 1, the opposite side being a mirror image thereof; and,

FIG. 4 is rear plan view thereof. 

The ornamental design for an earplug, as shown and described. 